Which device is using a motor? A. A water heater creates heat energy from electric energy

B. A waterfall rotates a waterwheel to turn an axle

C. A body massager uses electric energy to move back n forth

D. A solar charger creates electric energy from the Sun

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.